from multiprocessing import Process, Queue
import os, time, random


# 写数据进程执行的代码:
def write(q):
	print('Process to write: %s' % os.getpid())
	for value in ['A', 'B', 'C']:
		print('Put %s to queue...' % value)
		q.put(value)
		time.sleep(random.random())


# 读数据进程执行的代码:
def read(q):
	print('Process to read: %s' % os.getpid())
	while True:
		value = q.get(True)
		print('Get %s from queue.' % value)


if __name__ == '__main__':
	# 父进程创建Queue，并传给各个子进程：
	q = Queue()
	pw = Process(target=write, args=(q,))
	pr = Process(target=read, args=(q,))
	# 启动子进程pw，写入:
	pw.start()
	# 启动子进程pr，读取:
	pr.start()
	# 等待pw结束:
	pw.join()
	# pr进程里是死循环，无法等待其结束，只能强行终止:
	pr.terminate()
